Your search found 3 records
1 French, R. H.; Miller, J.; Curtis, S. 2003. Serendipity: Capturing a design level precipitation event. Journal of the American Water Resources Association, 39(2):477-486.
(Location: IWMI-HQ Call no: PER Record No: H032064)
2 Watson, A.; Miller, J.; Fleischer, M.; de Clercq, W. 2018. Estimation of groundwater recharge via percolation outputs from a rainfall/runoff model for the Verlorenvlei estuarine system, west coast, South Africa. Journal of Hydrology, 558:238-254. [doi: https://doi.org/10.1016/j.jhydrol.2018.01.028]
Groundwater recharge ; Rainfall-runoff relationships ; Models ; Percolation ; Coastal area ; Brackishwater environment ; Aquifers ; Groundwater table ; Water levels ; Catchment areas ; Soil types ; Evaporation ; Evapotranspiration ; Sensitivity analysis / South Africa / Verlorenvlei Estuarine Lake
(Location: IWMI HQ Call no: e-copy only Record No: H048590)
(3.76 MB)
Wetlands are conservation priorities worldwide, due to their high biodiversity and productivity, but are under threat from agricultural and climate change stresses. To improve the water management practices and resource allocation in these complex systems, a modelling approach has been developed to estimate potential recharge for data poor catchments using rainfall data and basic assumptions regarding soil and aquifer properties. The Verlorenvlei estuarine lake (RAMSAR #525) on the west coast of South Africa is a data poor catchment where rainfall records have been supplemented with farmer’s rainfall records. The catchment has multiple competing users. To determine the ecological reserve for the wetlands, the spatial and temporal distribution of recharge had to be well constrained using the J2000 rainfall/runoff model. The majority of rainfall occurs in the mountains (±650 mm/yr) and considerably less in the valley (±280 mm/yr). Percolation was modelled as 3.6% of rainfall in the driest parts of the catchment, 10% of rainfall in the moderately wet parts of the catchment and 8.4% but up to 28.9% of rainfall in the wettest parts of the catchment. The model results are representative of rainfall and water level measurements in the catchment, and compare well with water table fluctuation technique, although estimates are dissimilar to previous estimates within the catchment. This is most likely due to the daily timestep nature of the model, in comparison to other yearly average methods. These results go some way in understanding the fact that although most semi-arid catchments have very low yearly recharge estimates, they are still capable of sustaining high biodiversity levels. This demonstrates the importance of incorporating shorter term recharge event modeling for improving recharge estimates.
3 Miller, J.; Taylor, C.; Guichard, F.; Peyrille, P.; Vischel, T.; Fowe, T.; Panthou, G.; Visman, E.; Bologo, M.; Traore, K.; Coulibaly, G.; Chapelon, N.; Beucher, F.; Rowell, D. P.; Parker, D. J. 2022. High-impact weather and urban flooding in the West African Sahel – a multidisciplinary case study of the 2009 event in Ouagadougou. Weather and Climate Extremes, 36:100462. [doi: https://doi.org/10.1016/j.wace.2022.100462]
Extreme weather events ; Flooding ; Urban areas ; Climate change ; Global warming ; Risk ; Resilience ; Decision making ; Socioeconomic aspects ; Stakeholders ; Infrastructure ; Hydrological factors ; Climate models ; Case studies / West Africa / Sahel / Burkina Faso / Ouagadougou
(Location: IWMI HQ Call no: e-copy only Record No: H051203)
https://www.sciencedirect.com/science/article/pii/S2212094722000445/pdfft?md5=84475a21535d006cc45c7f276823b53a&pid=1-s2.0-S2212094722000445-main.pdf
https://vlibrary.iwmi.org/pdf/H051203.pdf
https://vlibrary.iwmi.org/pdf/H051203.pdf
(7.32 MB) (7.32 MB)
On September 1st 2009 an extreme high-impact weather event occurred in Burkina Faso that had significant impacts upon the capital city Ouagadougou and its inhabitants. Subsequent reporting and research has however not focused on the contributing socio-economic and hydrological factors and the role of global warming and climatic change remains uncertain. This reflects a paucity of evidence attributing such extreme weather events to climate change for the West Africa region and limits the knowledge base for urban planning to climate-related risks which pose serious threats. This case study provides a holistic assessment of the most extreme urban hydrometeorological event recorded in the West African Sahel, that links synoptic conditions to climate change and through to hydrological impacts on vulnerable urban populations. The intention is to inform regional decision-makers on climate change and flood-generating high-impact weather events at the urban scale and to bridge the gap between what scientists understand as useful and decision-makers view as useable at the city scale by providing interdisciplinary answers to key questions raised by local stakeholders.
Such an approach was shown to foster enhanced dialogue and engagement with stakeholders, while also providing a focus for communicating science at variable time- and spatial scales and between disciplines to improve understanding of how global processes have localised consequences. This reveals that Ouagadougou remains vulnerable to climate change and that such extreme weather events will become more frequent. But it is also demonstrated the complexity of attributing extreme events at such localised ‘urban’ scales to atmospheric phenomena affected by global climate change. Regional climate models are evolving and becoming more able to represent such extreme weather phenomena at suitable scales, enabling improved representation of climate-driven changes on such events, improving the ability for short-range forecasts in the future. Frameworks for managing flood risks however remain weak and under-resourced and there is limited capacity to manage flood risk from such events, particularly when rapid urbanisation amplifies vulnerability concerns. Recommendations are made to improve flood-resilience to future storms.
Such an approach was shown to foster enhanced dialogue and engagement with stakeholders, while also providing a focus for communicating science at variable time- and spatial scales and between disciplines to improve understanding of how global processes have localised consequences. This reveals that Ouagadougou remains vulnerable to climate change and that such extreme weather events will become more frequent. But it is also demonstrated the complexity of attributing extreme events at such localised ‘urban’ scales to atmospheric phenomena affected by global climate change. Regional climate models are evolving and becoming more able to represent such extreme weather phenomena at suitable scales, enabling improved representation of climate-driven changes on such events, improving the ability for short-range forecasts in the future. Frameworks for managing flood risks however remain weak and under-resourced and there is limited capacity to manage flood risk from such events, particularly when rapid urbanisation amplifies vulnerability concerns. Recommendations are made to improve flood-resilience to future storms.
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